Cirrus Logic CDB42L55, Manual

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8 DS773DB1
CDB42L55
3 CONFIGURATION OPTIONS
This section highlights two common configurations for the CDB42L55. It provides a basic understanding of how the
various components on the board work together.
3.1 S/PDIF or PSIA In to Analog Out
The CS42L55 analog back-end performance can be tested by selecting the “SPDIF In to Analog Out --
Analog In to S/PDIF Out” or “PSIA In to Analog Out -- Analog In to PSIA Out” quick setup file provided
with the software package. Note: The Control Port Compensation script for the associated VA supply
must also be selected. The script configures the digital clock and data signal routing on the board as shown
in
Figure 2 . The quick setup scripts provided in the software assume that a 24.000 MHz on-board oscillator
is populated in Y1.
A S/PDIF input must be provided as the S/PDIF Tx (CS8406) uses the RMCK signal from the S/PDIF Rx
(CS8416) for synchronization in this configuration.
Figure 2. S/PDIF or PSIA In to Analog Out
PSIA Tx (J78)
TX.SCLK
TX.LRCK
TX.SDOUT
Tx SRC
(CS8421)
PLL 24 MHz
(on-board osc.)
An on-board PLL generates all supported sample and
bit clock rates from an on-board 24 MHz oscillator.
Out
Out
S/PDIF Rx
(CS8416)
RX.LRCK
RX.SCLK
RX.SDOUT
S/PDIF
IN
LRCK
CS42L55
SCLK
DAC.SDIN 32
32
16
16
J2
J3
J4
J12
HP
Connection
HP
Channel
J21
B
A
Line
Channel
B
A
LINEOUTB
LINEOUTA
HPOUTB
HPOUTA
FPGA
(Master)
(Slave) (Slave)
MCLK